I work as a consultant for a lot of medium sized businesses and none of them have any intention of moving away from XP anytime soon. However, that does not imply that they want to move to any other operating system. The main reason they don't want to move away from XP is the support and training costs. Moving to OS X or Linux would be even worse.

All of these columnists miss the point -- OS X and Linux won't sell for exact same reason that Vista doesn't.